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Piping installation
Installer and user reference guide
66
RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452191-1B – 2020.10
1,2
VRV DX indoor unit
3
Branch selector unit (BS*)
4
Cooling only VRV indoor unit
A~E
Piping
a,b
Indoor branch kit
x,y
Outdoor multi connection kit
A, B, C: Piping between outdoor unit and (first) refrigerant branch kit
Choose from the following table in accordance with the outdoor unit total capacity
type, connected downstream.
In case of heat pump system
Outdoor unit capacity
type (HP)
Piping outer diameter size (mm)
Gas pipe
Liquid pipe
8
19.1
9.5
10
22.2
12~16
28.6
12.7
18~22
15.9
24
34.9
26~34
19.1
36~42
41.3
In case of heat recovery system
Outdoor unit capacity
type (HP)
Piping outer diameter size (mm)
Liquid pipe
Suction gas pipe
High pressure/
low pressure gas
pipe
8
9.5
19.1
15.9
10
22.2
19.1
12
12.7
28.6
14~16
22.2
18
15.9
20~22
28.6
24
34.9
26~34
19.1
36
41.3
38~42
34.9
D: Piping between refrigerant branch kits or refrigerant branch kit and BS unit
Choose from the following table in accordance with the indoor unit total capacity
type, connected downstream. Do not let the connection piping exceed the
refrigerant piping size chosen by the general system model name.
